164135321 has 4 divisors (see below), whose sum is σ = 187583232. Its totient is φ = 140687412.

The previous prime is 164135311. The next prime is 164135369. The reversal of 164135321 is 123531461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 123531461 = 2027 ⋅60943.

It is a cyclic number.

It is not a de Polignac number, because 164135321 - 2¹⁰ = 164134297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164135311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11723945 + ... + 11723958.

It is an arithmetic number, because the mean of its divisors is an integer number (46895808).

Almost surely, 2^164135321 is an apocalyptic number.

It is an amenable number.

164135321 is a deficient number, since it is larger than the sum of its proper divisors (23447911).

164135321 is an equidigital number, since it uses as much as digits as its factorization.

164135321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23447910.

The product of its digits is 2160, while the sum is 26.

The square root of 164135321 is about 12811.5307828534. The cubic root of 164135321 is about 547.5208763055.

Adding to 164135321 its reverse (123531461), we get a palindrome (287666782).

The spelling of 164135321 in words is "one hundred sixty-four million, one hundred thirty-five thousand, three hundred twenty-one".